Domountable cutting edge for drilling-tools.



H. R. HUGHES.

DEMOUNTABLE CUTTING EDGE FOR DRILLING TOOLS.

APPLICATION FILED MAY 2, I914.

Patented June 15, 1915.

2 SHEETS-SHEET 1.

um JV H. R. HUGHES.

DEMOUNTABLE CUTTING EDGE FOR DRILLING TOOLS.

APPLICATION FILED MAY 2, I9l4.

l,1%3,275. Patented June 15, 1915.

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M/IMJJJz' 171% 17/0 HOWARD R. HUGHES, OF HOUSTON, TEXAS, ASSIGNOR TO SHARP-HUGHES TOOL COMPANY, OF HOUSTON, TEXAS, A CORPORATION OF TEXAS.

DEMOUNTABLE CUTTING EDGE FOR DRILLING-TOOLS.

Specificationof Letters Patent.

Patented June 15,1915.

Application filed May 2,1914. Serial N0. 835,850.

To all whom it may concern:

Be it known that I, HOWARD R. HUGHES, a citizen of the United States, residing at Houston, in the county of Harris, State of Texas, have invented new and useful Improvements in Demountable Cutting Edges for Drilling-Tools, of which the following equipped with demountable is a specification.

This invention relates to rotary boring drills of the type in which the cutters consist of substantially disk-shaped rotatable members provided with sharp cutting edges that shear 011' the material from the side of the hole and having crushing portions that disintegrate the material on the bottom of the hole lying at one side of the zone where the sharp edges of the cutters dig into the bottom of the hole.

One object of my present invention is to provide a cutter of the general type mentioned, in which the sharp cutting edge is formed on a removable member or portion of the cutter.

Another object is to provide a cutter of the general type mentioned, in which the crushing portion is formed 011a removable member or portion of the cutter.

Another object is to provide a cutter of the general type mentioned, in which both portions of the cutter, namely, the 'sharn shearing edge and the crushing portion, can berenewed or replaced when either of said parts become dull or worn.

Another object is to provide a cutter of the construction above described, in which the removable portions of the-cutter can be taken off and replaced without removing the cutter from its support. And still another, object is to provide a drill having a pair of oppositely inclined cutters that are cutting edges and grinding portions or edges.

Other objects and desirable features of my invention will be hereinafter pointed out.

The invention is illustrated in the accompanying drawings, in which:

Figure 1 is a side elevation of a drilling tool fitted with cutters constructed in accordance with this invention. Fig. 2 is a spindle 14 secured to Figs. 4, 5, 6, 7, 8 and 9, inclusive, are details illustrating modified forms of the detachable mounting of the cutting edge. Fig. 10 1S2. detail in elevation, as seen on the line 10l0 of Fig. 5 in the direction indicated by 1the arrows, this view being on a reduced sea e.

More specifically, 12 indicates the hub of the'cutter, which is formed with an annular flange 13 on its rear edge and is designed tobe revolubly mounted on a trunnion or the head 15 of the drill; the spindle 14. being attached to the head 15 by a threaded connection to permit of its ready detachment and. removal. The cutter is held in place on the spindle 14: between a pair of washers 16 and 17, the outermost washer being held against dis placement by an annular flange 18; formed on the spindle 14 and comprisin a head for the latter.

In the preferred form of the invention shown in Figs. 2 and 3, the hub 12 is formed with a smooth tapered portion 19 on its periphery adjacent its juncture with the flange 13 and is threaded on its outer portion to receive a jam-nut of frustoconical form constituting an annular grinding member 20 as will later appear.

The cutter is provided with a cutting or shearing blade 21 in the form of a ring having its outer periphery formed with a knife edge 22 and its inner edge beveled to conform to the. tapered surface 19 on the hub 12. The blade 21 is positioned on the.

tapered portion 19 of the hub against the inner face of the flange 13 and is held there against by means of the grinding member 20 which is screwed on the hub 12 and caused to bear against the blade 21 to crowd the latter against the flange 13. The grinding member 20 is held against displacement by set screws 23 which are screwed therethrough and caused to bear against the outer face of theblade 21, thereby jamming the latter on the beveled face 19 and effectively locking the grinding member and blade against movement in relation to each other and to the hub 12.

In the modified 'form of the invention shown in Fig. 4, the grinding member 20 slips on the hub 12 and is secured thereto by means of bolts 24, which pass through the, flange 13 and are threaded into the grinding member in such manner as to clamp Y of the bolt 25 extends.

In the modification shown in Fig. 6, the grinding member 20 and the blade 21 slip over the hub 12 and are secured in lace by bolts 26, which ass through the ange 13 and through per orations 27 in the blade 21 and are threaded in the member 20 in such manner as to clamp the blade 21 between the member 20 and the flange 13; the blade being held against rotation by the bolts 26.

' In the modification shown in Fig. 7, the blade 21 is screwed on the hub 12 against the flange 13 and the grinding member 20 is also screwed on the hub 12 to abut against the outer face of the cutting blade to lock it in place; the grinding member and blade being further locked against movement in relation to each other by means of a set screw 28, which is threaded in the'memb'er 20 and bears against the cutting blade.

In the modification shown in Fig. 8, a construction corresponding to that shown in Fig. 5 is employed, excepting that the grinding member 20 is engaged by -means of a counter-sunk set screw 29 screwed in the flange 13 and having its inner end engaging the grinding member.

In the modification shown in Fig. 9, the blade 21 is carried upon a flange 30 formed on a ring 31 having an inclined inner wall.

32; this ring 31 being held in position on the hub 12-by means of a ring 33 which is screwed on the hub 12 and is formed with a beveled outer periphery adapted to engage the inner periphery of the ring 32 to crowd the latter against the blade 21 and clamp the blade against the flange 13.

The tapered outer periphery of the grinding member 20 is formed with serrations or teeth 35, and serrations 36 are preferably formed on the outer periphery of the flange 13. The serrations 35 and 36 of the grinding member 20 and flange 13 serve to break up and crush the materials severed and loosened by the cutting blade 21 when the drill is in operation. This operation is effected by the rotation of the drill head 15, which, in revolving, carries the cutters therewith; the cutting blades severing the materials at the sides and end of the bore, and the grinding member 20 cooperating with the serrated flange 13 to crush the materials thus loosened so as to reduce the work of the cutting edge m passing through the loosened materials and thus facilitating the drilling operations.

What I claim is:

1. A drill, comprising a head that is adapted to be connected to a drill stem, a revoluble member on the head, an annular blade carried on said member, and means for detachably connecting said blade to the revoluble member, including a frustoconical member having a roughened portion on its tapered periphery that cooperates with the blade to disintegrate the material in which the hole is being formed.

2. A rotary cutter for boring drills consisting of a hub provided with an annular flange, an annular blade surrounding the hub, and means for detachably clamping said blade against said flange, said means consist-- revolubly mounted on said trunnion, an annular blade supported on said cutter member, and means for detachably connecting said blade to the cutter member, comprising an annular member formed with a serrated periphery which constitutes a crushing-surface that disintegrates the material on the bottom of the hole.

4. In a drilling tool, the combination with a head, of a trunnion detachably mounted thereon, a rotary cutting member on said trunnion having a hub portion with an annular flange formed thereon, a blade encompassing the hub, a member for crowding the blade against the flange, and means for locking the member and blade against displacement, said member having a tapered periphery formed with grinding serrations.

5. In a drilling tool, the combination with a head, of a trunnion detachably mounted thereon, a rotary cutting memberon said trunnion having a hub portion with an an-, nular flange formed thereon, a blade encompassingthe hub, a member for crowding the blade against the flange, and means for locking the member and blade against displacement, said member and flange formed with I serrations on their peripheral edges.

that cooperates with the blade to disintegrate the material in which the hole is being formed.

8. A cutter for rotary boring drills-comprising a hub, a removable annular cutting blade mounted on the hub, a removable annular grinding member arranged on the hub adjacent said blade and provided on its periphery with a roughened surface that cooperateswith the blade to disintegrate the material in which the hole is being formed, and means for securely retaining said blade and grinding member in operative position on the hub.

9; A cutting disk for drills, comprising a hub having 'a flange, an annular blade on the hub adjacent the flange, and a removable grinding member adjacent the blade on the side thereof opposite the flange that is provided with a roughened surface which cooperates with said blade to disintegrate the material in which the hole is being formed.

10. A cutter for drills, comprising a hub having an annular flange and a grinding on the side opranged adjacent the flange, and a grindingmember adjacent the blade on the opposite side of the flange, comprising a frustoconical ring having a serrated peripheral edge.

13. A drill, comprising a head, a revoluble member on the head, an annular blade carried on said member, and means for detachably connectingsaid blade to the revoluble member, including a frustoconical member that has a roughened surface on its tapered periphery that constitutes a grinding portien, e

14. In a tool, the combination with a head, of a trunnion detachably mounted thereon, a rotary cutting member on said trunnion having a hub portion with an annular flange formed thereon, a blade encompassing the hub, and a member for crowding theblade against the flange, and means for locln'ng the member and blade against displacement, said member having a tapered periphery formed with grinding serrations.

15. A cutter for rotary boring drills consisting of a substantially disk-shaped member provided with a demountable cutting formed with a ser-' .rated edge, anannular cutting blade aredge and also having a crushing portion, said cutter being adapted to be arranged in such a manner that said cutting edge shears off the material from the side wall of the hole and said crushing portion disintegrates the material on the-bottom of the hole lying at one side of the zone where said cutting edge acts on the bottom of the hole.

16. A cutter for rotary boring drills consisting of a substantially disk-shaped memberprovided with a sharp edge. and also having a removable crushing portion, said cutter being adapted to be arranged in such a manner when it is in service that said sharp edge shears ofl the material from the side wall of the hole and said crushing portion disintegrates the material on the bottom of said sharp edge.

, 17. A cutter for rotary boring drills provided with a removable shearing portion and also having a removable crushing portion, said cutter being intended to be arranged in such a position that when it is in service said Shearing portion will act on the side wall of the hole being formed and said crushing portion will disintegrate the material on the bottom of the hole lying at one side of the zone where said shearing portion acts on the bottom of .the hole.

18. A cutter for rotary boring drills provided with a demountable cutting edge and also having two crus g portions arranged on opposite sides of said cutting edge, said cutter being adapted to be arranged in such a manner that said cutting edge will shear ofl" the material from the side wall of the hole and said crushing portions will disintegrate the material on the bottom of the hole.

19. A cutter for rotary boring drills provided with a demountable cutting edge and also having two crushing portions provided with roughened surfaces arranged on opposite sides of said cutting edge, one of said crushing portions being removable.

20. A cutter for rotary boring drills having a hub that is provided with a tapered portion, an annular shaped blade on said hub, and means for forcing said blade onto the tapered portion of the hub.

.21. A cutter for rotary boring drills having a hub that is provided with a tapered portion, an annular shaped blade on said hub, means for forcing said blade onto the tapered portion of the hub, and an abutment on said hub against which one side of said blade bears.

22. A rotary boring drill consisting of a head, and a rotatable cutter on said head arranged in such a manner that the lower portion of same inclines inwardly toward the longitudinal axis of the head, said cutter comprising a removable blade that shears ofi the material from the side wall of the hole, and a retaining device for said blade boring drill consisting of ahead provided with substantially diskshaped cutters arranged in such a manner that the lower portions of same incline inwardly toward the vertical axis of the drill head, said cutters having removable shearing edges that remove the material from the side Wall of the hole, and removable crushing portions that disintegrate the material on the bottom of the hole lying outside of the zone Where said shearing edges act on the bottom of the hole.

In witness that I claim the foregoing I have hereunto subscribed my name this 25th day of April, 1914.

HOWARD R. HUGHES.

Witnesses MARGUERITE BATES, MARIE BATTEY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

